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    • 13. 发明申请
    • METHOD AND APPARATUS FOR LWD SHEAR VELOCITY MEASUREMENT
    • LWD剪切速度测量的方法和装置
    • WO0239143A9
    • 2003-10-02
    • PCT/US0147783
    • 2001-11-13
    • BAKER HUGHES INC
    • TANG XIAO MINGPATTERSON DOUGLASWANG TSILILEGGETT JAMES V IIIDUBINSKY VLADIMIR
    • E21B47/14E02D1/00G01V1/00G01V1/40G01V1/44G01V1/28G01V1/52
    • G01V1/44
    • The logging tool (55) of this invention includes a transmitter conveyed on a drilling collar (90) for exciting a quadruple signal in a borehole (26) being drilled by a drill bit and a receiver for receiving the signal. The transmitter (105) is operated at a frequency below the cut-off frequency of the quadruple collar mode. The received signal consists primarily of the formation quadruple mode which, at low frequencies, has a velocity that approaches the formation shear velocity. The transmitter, in one embodiment, consists of eight equal sectors (101 et al) of a piezoelectric cylinder mounted on the rim of the drilling collar. The value of the cut-off frequency is primarily dependent on the thickness of the drilling collar. Alternatively, the transmitter may be operated to produce both the collar mode and the formation mode and a processor may be used to filter out the collar mode.
    • 本发明的测井工具(55)包括在钻铤(90)上传送的发射器,用于激发由钻头钻孔的钻孔(26)中的四重信号和用于接收信号的接收器。 发射机(105)的工作频率低于四极耳模式的截止频率。 接收到的信号主要由形成四重模式组成,其在低频处具有接近地层剪切速度的速度。 在一个实施例中,发射器由安装在钻铤的边缘上的压电圆柱体的八个相等的扇区(101等)组成。 截止频率的值主要取决于钻铤的厚度。 或者,发射机可以被操作以产生领模和形成模式,并且处理器可以用于过滤掉套环模式。